Add MD ink drop ripple to shelf app items

ui/views/controls/button/custom_button.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/controls/button/custom_button.h"
 
 #include "ui/accessibility/ax_view_state.h"
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/events/event.h"
 #include "ui/events/event_utils.h"
@@ skipping 390 matching lines @@
 CustomButton::CustomButton(ButtonListener* listener)
     : Button(listener),
       state_(STATE_NORMAL),
       hover_animation_(this),
       animate_on_state_change_(true),
       is_throbbing_(false),
       triggerable_event_flags_(ui::EF_LEFT_MOUSE_BUTTON),
       request_focus_on_press_(false),
       notify_action_(NOTIFY_ON_RELEASE),
       has_ink_drop_action_on_click_(false),
-      ink_drop_action_on_click_(InkDropState::ACTION_TRIGGERED),
       hide_ink_drop_when_showing_context_menu_(true),
       ink_drop_base_color_(gfx::kPlaceholderColor) {
   hover_animation_.SetSlideDuration(kHoverFadeDurationMs);
 }
 
 void CustomButton::StateChanged() {
 }
 
 bool CustomButton::IsTriggerableEvent(const ui::Event& event) {
   return event.type() == ui::ET_GESTURE_TAP_DOWN ||
@@ skipping 33 matching lines @@
 #endif
 
   return check_mouse_position && IsMouseHovered();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // CustomButton, Button overrides (protected):
 
 void CustomButton::NotifyClick(const ui::Event& event) {
   if (has_ink_drop_action_on_click_)
-    AnimateInkDrop(ink_drop_action_on_click_);
+    AnimateInkDrop(InkDropState::ACTION_TRIGGERED);
   Button::NotifyClick(event);
 }
 
 void CustomButton::OnClickCanceled(const ui::Event& event) {
   AnimateInkDrop(views::InkDropState::HIDDEN);
   Button::OnClickCanceled(event);
 }
 
 }  // namespace views